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在进行了室内模拟实验,建立岩体失稳模型,对注水压力统计分析,以及对葡北油田原始地应力计算、岩石力学参数实验等综合分析基础上,计算得出葡北油田防止套管损坏注水压力。分析计算结果表明,葡北油田套管损坏的主要原因是不同岩性岩石的层间滑动。注水压力是使层间滑动的动力,注水地层以上泥岩层的水化是诱发地层层间滑动的重要原因。随着注水压力的增加,层间的滑移量随即增加,在某个注水压力值后,滑移量呈线性增加。滑移层不发生在注水层,而是发生在注水层以上的泥岩层。建议采取控制泥岩层浸水和水化措施来预防套损,断层附近应尽可能减小注水,防止断层浸水和断层滑动。对于注水压力较高的区域,建议将注水压力降低到临界压力以下;在未水化地层,地层压力控制在24MPa以下;已发生水化地层,地层压力应控制在22MPa以下。
Based on the comprehensive analysis of the in-situ stress calculation and the rock mechanics parameter test in the Pubei oil field, the simulation of instability of the rock mass was established, the statistical analysis of water injection pressure, and the calculation of the casing damage prevention in Pubei Oilfield Water pressure. The analysis and calculation results show that the main reason of casing damage in Pubei Oilfield is the interlayer sliding between different lithology rocks. Water injection pressure is the power to slide between the layers. Hydration of the mudstone above the water injection formation is an important reason for the slip between layers. As the injection pressure increases, the slip between the layers increases, and after a certain injection pressure, the slip increases linearly. The slip layer does not occur in the water flooding layer, but rather in a mudstone layer above the water flooding layer. It is recommended to control the muddy water soaking and hydration measures to prevent casing damage, water injection should be reduced as far as possible to prevent the fault flooding and fault slide. For areas with high water injection pressure, it is recommended to reduce the water injection pressure below the critical pressure; in unhydrated formations, the formation pressure should be controlled below 24MPa; hydration strata occurred and the formation pressure should be controlled below 22MPa.